The next day, Sonic, his friends, and the girls were at the portal to Equestria. They were saying goodbye to Twilight and Spike.

"Sure wish you could stay longer," Applejack said.

"Me too," Twilight said, "But I have responsibilities back in Equestria that I have to get back to. Its citizens need me."

The others still smiled as Twilight said, "But now I can go through the portal whenever I need to. This isn't goodbye. It's just goodbye till next time."

Twilight asked Spike, "Ready?"

"Ready," Spike said.

As Twilight and Spike entered the portal, Sonic spoke, "See you, Princess Twilight."

Twilight nodded before she and Spike were fully through the portal and back in Equestria. Applejack then said, "Come on, y'all. There's till one thing we all need to do before Sonic and his friends go home."

The Sonic-Rainbooms nodded. Later, they were all back at the stage. They were setting up for their special song. As they were almost ready, Sunset was writing a message to Twilight in a brown journal that had her symbol on it.

Dear, Princess Twilight. Missing you already and hoping you'll be back soon. Things are definitely looking up for me here at Canterlot High. But I know I still have a lot to learn about Friendship. Hope you don't mind if I write to you for advice when I need it. Your friend, Sunset Shimmer."

Once she was finished and closed her journal, Rainbow called to her, "You ready or what?"

"Ready," Sunset as she came to the Sonic-Rainbooms with her guitar.

Pinkie, Manic, and Silver banged their drumsticks together as they counted down, "1 2 3 4!"

(Shine like Rainbows (Full Song))

The Sonic-Rainbooms began to play their song as they were immediately in their outfits and ponied up. Each of them were together on a different platform of an amazing colorful setup on the stage.

Knuckles and Applejack: Once upon a time

You came into my word and made the stars align

Silver and Rarity: Now I can see the signs

You pick me up when I get down so I can shine

Sonic-Rainbooms: Shine like Rainbows

We shine like Rainbows

Shine like Rainbows

We shine like Rainbows

Sonic and Rainbow: Friends, you are in my life

And you can count on me to be there by your side

Shadow and Sunset: And when the music comes alive

We sing our songs to lift us up so we can shine

Rainbooms: And the sound that we hear in our hearts

It's a crescendo (Ah-ha-ah)

Sonic Heroes: And the light that ignites in the dark

It makes us all glow

Sonic-Rainbooms: And shine like Rainbows

We shine like Rainbows

Shine like Rainbows

We shine like Rainbows

(Ah) Together we stand as the rain begins to fall

And holding our hands up high as the sun shines it AAAAALLLL!

Everyone began to sing all together.

Everyone: And the sound that we hear in our hearts

It's a crescendo (Rarity: Crescendo)

And the light that ignites in the dark

It makes us all glow (Manic: All glow)

And shine like Rainbows (Fluttershy: Shine like Rainbows)

We shine like Rainbows (Tails: Oh, we shine like Rainbows)

Shine like Rainbows (Rainbow: Shine like Rainbows)

We shine like Rainbows (Sonic: We shine like Rainbows!)

Sonic-Rainbooms: We shine like Rainbows!

(End of song)

The whole crowd cheered in utter amazement. The song was so wonderful. The Sonic-Rainbooms gave a bow to the crowd and they cheered even more.

Celestia walked up to the Sonic-Rainbooms, "Congratulations, kids. You've won the Battle of the Bands, and you've saved us all from that monster. We thank you for your protection."

The Sonic-Rainbooms smiled and nodded. Sonic turned to others, "Well, it's time for us to return home."

Even though the other Mobians and the Rainbooms still wanted to hang out, they need that Mobius needed them.

Later, when it was the end of the day, Sonic and his friends used the Chaos Emeralds and Tails' arm cannon to open the portal back to Mobius. They turned to their girlfriends.

"We're gonna miss you all," Knuckles said.

"Same thing for us," Applejack said.

"I wish we had more time," Fluttershy said.

"So do we," Tails said, "But we have to be sure that Eggman isn't causing trouble over Mobius. The citizens there need us, just like the citizens of Equestria need Twilight."

The Mobians came to their girlfriends and gave them a goodbye hug and kiss. Then Tails, Knuckles, Manic, Shadow, and Silver went into the portal and went back to Mobius.

Before Sonic went in the portal, he was having a quick work with the Rainbooms.

"Well, it was great to have ya back, Sonic," Applejack said.

"I know," Sonic said, "And it was great to see you all again."

Sonic then said to Sunset, "It was also great to help you feel happy again, Sunset."

Sunset smiled, "Thank you, Sonic."

Sonic waved goodbye to the Rainbooms and quickly jumped into the portal back to Mobius before it closed. The girls just stood where they were thinking about their boyfriends.

"Goodbye, Sonic," Rainbow thought.

"Goodbye, Tails," Fluttershy thought.

"Goodbye, Knuckles," Applejack thought.

"Goodbye, Manic," Pinkie thought.

"Goodbye, Silvy," Rarity thought.

"Goodbye, Shadow," Sunset thought.

Meanwhile, in some sort of a lab, on a wall was a Bristol board with pictures of… everything that happened since when Sonic and Princess Twilight came to Canterlot High for the first time! And there were pictures about the Battle of the Bands as well. At the center of the board was a picture of Canterlot High itself.

The person who had all of this stuff was… the Twilight Sparkle of this world. The only difference with her was that she had black glasses and her hair was tied up in a bun. She said to a dog that was eating dog treats, this world's Spike.

"No doubt about it, Spike. There's definitely something strange going on at that school," Twilight said,

Spike just barked.

Somewhere, in a different location…

Somewhere in a base, people in strange outfits were working on mysterious projects. They seemed to be studying something about portals.

Near the doorway in the dark were two mysterious figures; a male and a female.

"So, Lord Strafe said that we're actually going to this other world?" the female asked. She sounded really familiar to a certain someone, but it sounded cyborg-like.

"Yes," the male said, "He's willing to find Strike and Specter and destroy anyone who stands in our way."

"But do you realize that we may be walking into a trap?" the female asked.

"Before Master Claw was killed, he and his minions made technology that allowed them to travel to different dimensions, but this took us a long time to be prepared for," the male said.

"Are you really sure about this, Black Ghost?" the female asked.

"Of course I am," Ghost said, "…Rainbine."

NerfSonicRD: Hey, everyone. I hope you enjoyed reading my Sonic/Rainbow Rocks crossover. This is only the second story of the Sonic and Equestria Girls Series. And I'm sorry this took me a while to write, but I'm not like most other Fan Fiction writers. Anyways, some credit of this story goes to my YouTube friend, DarkHunter677.

DarkHunter677: I have to say, it was fun to work on this story with my buddy here. The storyline itself is very interesting. I found my OC got into more trouble than I expected.

NerfSonicRD: His OC is Specter. My OC is Strike, and those others characters were ones that I created. And just to let you know, I am working on the third story, Friendship Games, but it's going to take a long time because DK here and I are going though high school, so please be as patient as possible.

DarkHunter677: I'm hoping for some future stories, I can throw some of my OCs into them and see what happens.

NerfSonicRD: Yep. And two more things. 1, for anything that sounds familiar to other stories that I might have taken without permission and without even realizing, I apologize. I'll be sure to ask next time before I start writing. And 2, I'll also be working on characters for the next story that may Or may not be based on other characters from comics. If any of you have any suggestions on what or who to create, please let me know in your reviews in the review section!

That's all! Thanks for reading!